Wisconsin · FIPS 55073 · County seat: Wausau
Marathon County, WI GIS & Parcel Viewer
Marathon County, Wisconsin parcel data lives on the Marathon County parcel map. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Marathon County parcel map ↗
Opens maps.co.marathon.wi.us in a new tab. We link out and never embed or copy parcel data.
Marathon County at a glance
| Official map | Marathon County parcel map |
|---|---|
| Type | County-run map |
| Website | maps.co.marathon.wi.us |
| Access | Free, no login (checked Oct 2026) |
| County seat | Wausau |
| Population | 138,612 (2023 Census Bureau estimate) |
| Land area | 1,545 sq mi |
| FIPS code | 55073 |
Who runs this map
Marathon County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this map
- Press the button above to open the county's own web map.
- Search for the property or pan and zoom to it.
- Click the lot to bring up what the county publishes about it.
- Look for print or measure tools if you need a quick map or rough size.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
The U.S. Census Bureau estimated Marathon County's population at 138,612 in 2023, spread over about 1,545 square miles of land, or roughly 90 people per square mile. By population it ranks 10th of 72 counties in Wisconsin. Its county seat is Wausau.
Nearby parcel maps
Parcels close to the edge of Marathon County can fall in the next county over. Neighboring counties:
- Clark County
- Langlade County
- Lincoln County (state list)
- Portage County (state list)
- Shawano County (state list)
- Taylor County
- Waupaca County (state list)
- Wood County (state list)
More on Marathon County parcel maps
Before you rely on the lines
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.